Chuck



May 17, 1932- c. E. VAN NORMAN I 1,858,693

CHUCK Filed Feb. 25, 1928 V JNVENTOR.

5644/ 6? WW M lrroRNEx s.

'inganddpositionmg objects which are to be en Jecte to menu a 'of a ball bearing while the race is being ground interiorly. The object of the inven- Patented M03 17, 1932 UNITED STATES PATENT OFFI E 'f cmms E. van Noam, or sramermnn, massacnusn'rrs, sssrenor. 'roym 110mm mama roor. comramr, or SPRINGFIELD, -mssacnusEm-s, a con- ,ronarrou or uassacnusnr'rs a cnucx' Application filed February 25, 1988. Serial No. 257,050.

My invention relates to chucks for graspby a pair of lock nuts 25. A driving pulley cturing operations, and 26 has a hub will be described with specific reference to and held by a chuck designed .for holding the outer race andwork may be rotated as desired.

Passing through the spindle 17 is a tube 29 carrying at one end a button 30 contact- I tion is to provide a chuck which will combine 'ing with the central portion of the plate 12 speed of operation with great accuracy'in t e positioning of an article. the rlght in Fig. 1 the plate will be bowed Referring to the drawings; outwardl To the other end of the tube a Fig. 1 is a side elevation of the preferred thrust co ar 31 is threaded and held fixed in so that when the tube is forced slightly to 17 and held againstjlongitudinal movement ortion 27 keyed to the spindle ock nuts 28, so that the chuck embodiment of chuck, partlybroken away adjusted position by a set screw 32. To move 'lii 10 is provided with an' outwardly extending i the screws are adjusted roughly, locked in po- This distortion of the sition by nuts 16, and then collectively ground 7 gles' of the lugs 14, m

' v .formed by a t'aper'bushing 21 fitting wit in the housing and held against endwise motion, to;

' a Fig. 2 is an end elevation thereof.

' of t e plate securing screws 13,-are lugs 14 ends 0 these screws are finished to common in, machines of'this'ty into axial section; and the tube, this thrust collar is pressed against by an abutment. 33 formed on a rocker 34 ivoted at 35 to a member 36, which is held y set screws 37 in adjusted position upon a flange to which a plate 12 is secured as by a rod 38 secured tothe hpusin 20. To the free circumferential series of screws 13. The end of the rocker is pivote at 39 a link 40, plate is made of material sufliciently flexible which at its other end is I so that it may be bent transversely somewhat lever 42 swin g upon a ring 43011 the as the" bottom ofvapan may be forced in or housing and armed with an operating hanout, although not to that extent. Projecting dle 44. A sto parallel to the axis of the chuck, and ar"-' motion of the ran ed about a circumference within that deflection of plate 12. I I I The chuck as so fardescribed functions in throu h which pass screws 15 secured in ad'- he l o ngthe a d is justef ition by lock nuts 16.. The inner moved downwardly in Fig. 1;, the tube29 will rovide ,be moved slightly to the right and button 30 In the embodiment shown, the chuck head graspin and bearingsurfaces for as will befully described below. Preferably right hand face in Fig. 1 becoming convex.

'ng thelugs diverge accurately to the size desired. I towards I I I .The chuck head 10 is screwed to a. spindle ing screws 13-to move individually on radial 17 which may be rotated in any of the ways lines awgy from the axisofthe'chuck'. This I e. In order. motion,- t I to complete the. disclosure of .t e preferred the object m belng removedjrom-orplaced settin oithe invention, Lhaveshown the between the series of screws.;;-;Wheuthe hanspind e as formed with a tapered. bearing dle is released the clasticityofthe plate causes portion 18 fitting within a correspondingly it. to return to its normal gositi'om-th shaped bushing 19 within ahead or housing tioning' screws 13 being; ereb 20. A second reversely tapered bearin :is wardlytogrip the object-mtifg wung I m- Chucks of'the type describediar towards the right in Fig. 1 by a peripheral gree ofaccuracy, such as ball races,-as the flange 22 abutting against the end of the separationxof their gripping devices, and the housing. Bearing against this isthe-flange toleranceof these glripping device}? whep. in amount. orma 23 of a tapered sleeve. 24 keyed to the spindle" closed, are very sma ivoted at 41 to a screw 45 serves to limit the. andle in a direction to cause olding willbe pressed against the central portion of and positioning the object to be worked upon, e plate 12. The plate is bowed outwardly, its

late changes the anthe right, and causes the positionesignd hough slight, is suflicient-to permit deal with articles made with "a high dea 47 in the 1y negligible variations in outside dimen- 'sions of the article, have, therefore, a rela-- t ve great eiiect u n the action oi the chuc It is the ObJOCt of the premnt invention to insure accuracy in the positioning 7 of the article in a direction axially of the chuck in two ways: first, by making the axial position ofgithe article independent of the deflection of the plate; and second, by causing the swinging motion of the positioning screws in closing to seat the object firmly in exact axial ition. These results I have accomplishe by forming the axiainpositioning means as pins .46 secured fir y to the head 10 and passin ghfreely through holes plate 12. e free ends of the pins are fimshed off accurately, as by grindmg after assembly with the head, to serve as stops for the article, "which when pressed inst them' will be in the exact axial position desired.

now that the plate 12 has been j after the screws contact with the article, and

.iace

bowed outwardly by handle 44 through the action described, an. object m to be operated upon isplacedwbetwecn the inner ends of the (positioning screws 13 and against the ends of then released. they close in upon the article the ends of screws 13 each swing'upon an arc, combinin a motion radially towards the axis of the c uck with a motion parallel'to the axis. This motion continues even results in a pulling of the 'article'tightly against the stop pins 46 with a slight slipp of the tioning screws upon theoutcr sur ace of t e article. 7

As mentioned above, the chuckhas been described in connection with a machine for ding the inner surfaces of ball races. I

' ave illustrated in the drawings a grinding wheel-49 mounted upon as indle 50, and a chanical princip es described will suggest" hole 51 has been formed t ugh the button and the late 12 for the admission of water through &e spindle during the grind.- operation. This setting of the invention is illustrative onl and other uses of the meth'emse'l'ves to those skilled What is:

1. A chuck. comprising a rotatable head, a

in the art.

ment and for axial object ins 46. The handle 44 is independently of the plate for limiting the position of an object 1n a direction axially of the members, and means for bending the late axially so as to cause the holding memrs to be moved radially.

3. A chuck comprising a circular series of whereby axial slippage of said snembers on the object will occur and firm 'tioning of the object against the stop w 1 be assured.

4. In a diaphragm chuck, a chuck body,

a diaphragm secured thereto, chuck jaws carried by said diaphragm, means for flexing said diaphragm for moving said chuckjaws, and work stopmeans for positionin awork piece held y said jaws, said wor stlpp means being independent of said diap re 5. na diaphragmchuck, a chuck body, a diaphragm secured thereto, chuck jaws carried by said diaphragm, means for flexing said diaphragm for moving said chuck jaws, land work stop means secured to said chuck body and independent of said diaphra I 6. a diaphragm chuck, a chuck body,

'a diaphragm secured thereto, chuck jaws carried by said diaphragm, means for flexing said dia hragm for moving said chuck jaws,.said iaphragm having an aperture therethrough, and a work stop carried by said chuck body .and passing throughsaid diaphragm so as to be inde ndent thereof. Initestimony whereof I ave aflixed my signature.

. CHARLES EFVAN NORMAIL;

' flexible plate secured peripherally to the f head, a circular series of holding members 'una ected by bending ".for'bending the late axially so as to' cause projecting laterally; from; an intermediate circumference of plate, a series of back Stop.

' through holes in the plate so as to be thereof, and means the holding mem rs to .be moved radially.

pins'secured to the head and'passin'g 2.3L chuck com risin a.-hea'.d,.a flexible yfitothe head,acircular series o ,ho g members progecting laterally from an-intermediate -,circumer of the plate, atleast one stop'mounted; 

